factors of 35xy (numerator)
= 5, 7 , x, y
factors of 42x (denominator)
= 6, 7, x
In a fraction, you can remove common factors from BOTH numerator and denominator, as long as it is not a zero.
Here the common factors are 7 and x.
So the numerator becomes 5y
and the denominator becomes 6
Can you take it from here?

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